MARINE ANTIFOULING PAINT

摘要

A marine anti-fouling paint comprises a film-forming polymeric binder which is a salt or ester of a polyanion and is insoluble in water but is capable of being hydrolysed by sea water to generate a water-soluble salt of the polyanion, for example a copolymer containing 50 to 80 per cent by weight of units of a triorganotin salt of an olefinically unsaturated carboxylic acid or 20 to 80 molar percent of units of a quinolinyl or substituted quinolinyl ester of an olefinically unsaturated carboxylic acid, and a pigment component comprising a metallic salt of an organic dithiocarbamate which is sparingly soluble in sea water, for example zinc ethylene bis(dithiocarbamate), and a molecular sieve zeolite. The dithiocarbamate improves the anti-fouling performance of the paint on a ship which is inactive and the molecular sieve zeolite reduces the tendency of paints comprising a polymeric binder and a dithiocarbamate to gel or thicken on storage.